tv Station power vs time.

mar,2003

     The power in the 6 Mhz band of each tv Station is monitored using the hilltop monitoring system.
There are 5 frequency bands of the rfi monitoring system that contain tv stations: (70, 165, 235, 550, and 725 Mhz). A peak hold on a band (duration 1 minute) is repeated  every 20 minutes. This gives  74 measurements per band  per day. For each tv station:

    Some things to be aware of:

  1. Each hilltop monitoring band has a different tsys and gain. The plots include these values. At the bottom of each plot are two dashed lines.
  2. Use these lines to check whether the power in the band is changing. They are integrated over 100Khz rather than the 6Mhz of each tv station.
  3. When the red and black dashed lines go to zero, there is no rfi monitoring data.
  4. Leakage between channels. Tv stations are spaced by 6 Mhz. For strong tv stations there is leakage between channels in the spectrum analyzer. If you see adjacent channels moving together then this is probably the reason. The channel with the higher power is the channel that is resposible for the power.
  5. The spectrum analyzer on the hill may be off in frequency by up to .6 Mhz. This will also mix stations a little.
  6. When the 430 Mhz transmitter is on, many of the hilltop monitor bands saturate. When you see many tvStations moving together, this is probably the reason.
  7. If a tv station jumps around a lot in the median power plot, look at the mean or max power plot. The station is probably turning on for half a day and the median is alternating between catching the on and off power levels.
 
date
daily median power
daily mean power
daily max power
daily min power
YearToDate
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2016
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2015
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2014
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2013
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2011
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2012
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2011
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2010
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2009
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2008
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2007
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2006
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2005
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2004
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2003
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2002
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2001
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2000
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1999
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1998
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Notes:


Tv channel frequencies.

processing: x101/rfi/tv/tvmon.pro
 home_~phil